package com.hyy.netty.c1;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.string.StringDecoder;

public class HelloServer {
    public static void main(String[] args) {
        //1、启动器，负责组装netty组件，启动服务器
        new ServerBootstrap()
                //2、BossEventLoop，WorkEventLoop(selector,thread)，group 组
                .group(new NioEventLoopGroup())
                //3、选择 服务器 ServerSocketChannel的实现类
                .channel(NioServerSocketChannel.class)
                //4、boss 负责处理连接 worker(child) 负责处理读写，决定了worker(child) 能执行哪些操作(handler)
                .childHandler(
                        //5、channel 代表和客户端进行数据读写的通道，Initializer 初始化，负责添加别的handler
                        new ChannelInitializer<NioSocketChannel>() {
                            @Override
                            protected void initChannel(NioSocketChannel ch) throws Exception {
                                //6、添加具体的handler
                                ch.pipeline().addLast(new StringDecoder());// 将 ByteBuf 转换为字符串
                                ch.pipeline().addLast(new ChannelInboundHandlerAdapter(){//自定义 handler
                                    //处理读事件
                                    @Override
                                    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
                                        //打印上一步转换好的字符串
                                        System.out.println(msg);
                                    }
                                });
                            }
                        })
                //7、绑定监听端口
                .bind(8080);

    }
}
